Frequently Asked Questions

We recommend gravel 10mm or below, such as pea gravel or crushed angular gravel, to be used to fill the 38 mm cells. We also have 50mm cells for larger size gravel or aggregates.

100% Virgin Polypropylene, which means this product is recyclable and will not leak any toxins into the environment.

Yes. We have a unique interlocking system which makes installation of our sheets a "snap". Since installation needs and conditions vary and may require some engineering or other professional input, so we recommend our product be installed by professionals.

Big slopes are okay, but no more than 20° for best results.

While you do not have the rutting and aggregate migration of traditional gravel installations, you still may need to occasionally rake the gravel. If you can see the CoreGRAVEL™ structure, you should rake gravel to completely cover the honeycomb, thus preventing damage and extending the product life.

CoreGRAVEL™ provides a porous paving solution which returns water back to the environment where it belongs instead of pooling or causing the flooding problems of traditional pavement installations. In addition, CoreGRAVEL™ is recyclable virgin Polypropeline which is UV and heat resistant therefore not easily broken down so will not leak toxins into the environment.

You can drive and park cars as well as trucks on the COREgravel™ product when installed properly.  Even without being filled it can withstand up to 40 tons of pressure. After being filled, COREgravel™ can withstand 100 tons of pressure. Our CORE6™ honeycomb design offers superior strength.


Our products are compatible with Sustainable (Urban) Drainage Solutions. Core6™ Landsape Systems are porous surfaces. SUDS can be either porous or permeable. The important distinction and advantage between the two is:  Porous surfacing is a surface that infiltrates water across the entire surface.

Learn more here: 

UK Environment Agency: Best management practices for urban drainage

Created by CIRIA (Construction Industry Research and Information Association), is the independent and authoritative platform for those involved in delivering sustainable drainage.

Source control using constructed pervious surfaces. Hydraulic, structural and water quality performance issues (C582)

Water runs through the gravel and geotextile membrane across the ENTIRE surface so this is a true porous paving product.

"Pervious surfaces can be either porous or permeable. The important distinction between the two is:

  • Porous surfacing is a surface that infiltrates water across the entire surface.
  • Permeable surfacing is formed of material that is itself impervious to water but, by virtue of voids formed through the surface, allows infiltration through the pattern of voids."

-CIRIA (the construction industry research and information association)

No. The geotextile membrane material that is fused to the bottom of COREgravel™ prevents weed growth. 


Soft surfaces are difficult for people with mobility impairments to negotiate and therefore should be avoided. CoreGRAVEL allows a natural look, yet still able to be navigated by road bicycles, strollers, and wheelchairs not designed for outdoor terrain. The ADAAG states, "materials stabilized and retained by permanent or temporary geotextiles (mesh), gridforms, or similar construction may perform satisfactorily for persons using wheelchairs and walking aids."

Learn more:

ADA Accessibility Guidelines (ADAAG) - Ground & Floor Surfaces

US DOT Federal Highway Administration: Designing Sidewalks and Trails for Access

ADA Homepage